Elastic-fluid turbine.



0 9 J 2 2 C E D D E T N. E T A P QM I T R U G mm C 7 ELASTIC FLUID, TURBINE. APPLIOAT IOIF FILED AUG. 1, 1902.

' N0 MODEL.

UNITED STATES Patented fiecem'be'r 22 1903.

PATENT OFFICE.

ELASTIC-FLUID TURBINE.

SPECIFICATION forming part of Letters Patent No. 747,857, dated December 22, 1903.

Application filed August 1, 1902. $erial No. 117.957. (N model.)

.To all whom it may concern.-

Be it known that I, CHARLES G. CURTIS, a citizen of the United States, residing in the borough of Manhattan,city of New York,State of New York,haveinvented a certain new and useful Improvement in Elastic-Fluid Turbines, of which the following is a description.

The object I have in view is to produce a simple and effective construction for the movable vanes of elastic-fluid turbines and for securing them in position upon the turbinewheel.

In the accompanying drawing is shown a radial section throughthe movable vanes and the wheel-rim to which they are secured.

1 l are the disks which'form the web of the wheel and to which is bolted the wheel-rim 2, made in a single piece or in curved sections. The wheel-rim is provided with outwardlyprojecting ribs 3at its edges, havinginclined inner faces, and with a central rib 4, also having its side faces inclined, the channels besides of the channel, and between the vaneblocks in each channel is placed a key-block 7, having beveled sides engaging the beveled sides of the vane-bases 6. The key-blocks 7 have the curved form of the wheel-rim and are made in sections of suitable length, breaking joints with the joints between the vaneblocks. The key-blocks 7 are secured in place by bolts 8, which pass through the wheel-rim and receive nuts 9 on their inner ends inside the wheel-rim. By means of the bolts and nuts the beveled key-blocks 7 are drawn toward the wheel-rim, forcing the vane-bases outwardly against the beveled sides of the dovetailed channels and securing the vanes rigidly in place. The outer ends of the vanes are encircledby bands 10, which are preferably secured in place by means of rivets 11, made integral with the ends of the vanes.

It is evident that this construction is adapted for any desired number of movable vanes.

What I claim is- 1. In an elastic-fluid turbine, the combination with a wheel-rim having a dovetailed channel of greater width than the vane-bases and extending entirely around the wheel-rim, of dovetailed vane bases inserted in said channel on one side thereof, each vane-base carrying a number of vanes, and beveled locking-keyssecuring the vane-bases inv the dovetailed channel of the wheel-rim, substantially as set forth.

2. In an elastic-fluid turbine, the combination with a wheel-rim having a dovetailed channel wide enough to accommodate two vane-bases, of two dovetailed vane-bases carrying movable vanes located in said channel on opposite sides, and a beveled key placed between the vane-bases and forcing them outwardly in said dovetailed channel, substantially as set forth. 7

3. In an elastic-fluid turbine, the combination with the wheel-rim having a dovetail d channel wide enough to accommodate two sets of vane-bases, of the dovetailed vanebases 6 placed in said channel, the-beveled key 7, and the bolts 8 drawing said key inwardly against the adjoining beveled sides of the vane-bases, substantially as set forth.

4. In an elastic-fluid turbine, the combination with a wheel-rim having a dovetailed of dovetailed vane-bases inserted in said This specification signed and witnessed channel on one side thereof, each vane-base this 25th day of July, 1902.

carrying a nu mher of vanes, beveled locking- A keys securing the vane-bases in the channel, CHARLES CURLIS' and an encircling band secured to the outer I Witnesses:

ends of the vanes by studs formed integral J'NO. ROBT. TAYLOR, with the vanes, substantially as set forth. 1 JOHN LOUIS LOTSCH. 

